That's what drove him to keep going. And he eventually got it. Crazy.

But then years later, he was apparently killed by some Indians because some of his old mates found some Indians and they were selling his rifle. So they slaughtered the Indians ... because that meant they had killed their friend.

Here's the story: https://www.americanrifleman.org/articles/2016/2/28/the-truth-about-the-revenant-hugh-glass-and-his-rifle/